There were three young men smoking in the toilets at Walmart, despite the signs forbidding it. I picked on this guy, tapping him on the shoulder and pointing to the sign above his head. He just shrugged and went back to looking at his phone. So, to the amusement of his friends, I held my camera phone right in front of his face and took this photo. Most Chinese apologise and quickly put out their cigarettes when you mention the "No Smoking" signs, but clearly not the younger generation who seem more liable to ignore (or pick a fight with) the interfering foreigner!